Speedometer.



No. 846.296. PATENTED MAR. 5 1907. A. FLEISGHMANN. SPBED-OMETER.

ATYLIGATION IILIJD MAY 11, 1906.

2 SHEETS-SHEET 1 ac/W417 diloivze VS PATENTBD MAR. 5, 1907.-

A. FLBISUHMAN N. SPEEDOMETER.

APPLIOATION 11pm: my 11, 1906.

' 2 SHEETS- 81133! 2.

ad-W; 7

- To all whom it may concern UNITED s rx'rns PATENT ent ies.-

ADALBERT FLEISCHMANN,'OFFRANKFORT-ON-THEMAIN, GERMANY, AS-

SIGNOR T 0 'THE FIR-M OFVOEQF-AMPERE-GESELLSOHAFT, FLEISCHMANN & 00., OF FRANKFORT-ON-THE-MAIN, GERMANYp I Be it known that I, -IADAIQB-ERT Firemen MANN, residing at Frankfort-on-theMain,

Kingdom of Prussia, -German'y, have invent- 5 ed new and useful Improvements-in Speedometers, of which the following is a specifica 'ti on. I

This invention relates to a speedometer specially suitable for motor-cars wherein the 1p speed is'indicated for instance, as expressed by the number of revolutions of a revolving I shaft by mea'ns of aa'p'ointer rigidly con- 'nectedgto a disk which'is rotated proportion I Specification of Iietters Patent. Patented March 5, 1907. 'hpplic ation filed May ll, i906- 'SerialNa-SlQZQB. U

rangedparallel thereto. The disk lc is fixed to a revolving shaft Z andcarries below'the' magnet-poles a number of arc-shapcd pieces of iron m, that are spaced apart from one another, said disk 7c and the arc-shaped pieces of iron m projecting beyond the edge or p e riphei'y of the copper disk g, so that said iron pieces m are entirely inclosed byv the magnetic lines of force." "The shaft l is'mounted in the us ual-mann'er by means of a ball-bear "ingiaso as to be capable of revolving in an extension of the casing a.

In-the constructional'form of the speedl {allyi to' the .revolving shaft, this result being I 1' brought about by causing .pieces of iron frontof or betweenthe poles of permanent "z'b;'fields producing "eddy-currents in suitably arranged metallic disks of non-magnetic ma ometer shown in l igs; 3,;a'nd 4 the bearing (2 for the shaft'c is ad ustably mounted on the I disk e, so that the plate is, composed of nonmagnetic material, which carries the pieces of iron m, can be vertically adjusted for the purpose of regulating the degree of-sensib ility of the speedometer in a simple and rapid ,manner.- For this purpcse'the support d, in which is mcuntedthe shaft 0, which carries which are fixed to the latter to be rotated inmagnets, whereby rotating or pulsating mag- {net'icfields areproduced in the' latter,v saidteriali T he instrument is illustrated in the accompanying dravs ings, where1n I I 2 5 1 igure 1 is a diametrical section of one con 1 structional form thereof, and Fig.2 is *a hori- II zcntal section on the line AA of Big. 1. Fig. 3 is a similar section to Fig. 1 of asecond constructional form, and Fig. 4 is a hcrizon- 3'0 tal section on the line B B of Fig. 3.

" Referring to'the figures, a is a casing of the speedometer. b are permanent stee magnets arranged in the casingv'ith their'poles N S directed inward toward the center of the 5 casingand leaving a central-vacant space.

In this space, at the center of the speedometer, a shaft 0 is mounted in a bearin d, which is I fixed, by means'of screws or o t er suitable means, to a disk e, that is provided with a 4o central circular aperture .To the lower eniof the shaft cis fixed a horizontal disk g, ofcopper, the periphery of which extends under the poles N S of the magnets b;

To the uplpler end of the shaft cis fixed a 4': pointer h,

scale designed to indicate the speed in revo- W 'ch is arranged to move over a lutions or kilometers per unit of time. A spiral .spring 1'. tends to return the pointer to its zero position and brings it back to such 50 position when the apparatus is inactive.

A second disk is, of non-magnetic material,

.is located below the copper disk 9 and ar- (Not shown-in Big. 3).

sion 1' of the casing a.

justed position by means of a lock-nut s.

' 'L'he' manner of operation of the described tor. fields produce in the copper disk eddy-curthe copper disk g, is arranged to be movable I in a vertical extension, which is connected which carries the iron pieces m, is fixed to the shaft Z, which rotates in a ball-bearing.

movein the directioncf its length; but to en- The shaft Z cannot able such a movement to take place it is mounted in' an outwardlyscreW-'threaded sleeve or socket g, which is vertically adjustable in an,internallyscrewthreaded exten- Itis held in its adspeedometer and revolutioncounter. is as follows: By the rotation of the shaft 1 with the disk is. and the pieces of iron m the latter attact the magnetic fields with them in their direction of rotation,, and also they shortcircuit the magnetic fields alternately. The iron pieces m thus produce a continuous pulsating and traveling of the magnetic fields in the same manner as in a rotary-current mo- The pulsating and traveling magnetic 'io armature, the latterprojecting beyond said disk so as to be entirely inelesed by themagrents by which the copper disk is caused to rotate in the direction-of the traveling magnetic fields.

;What I claim as new and of my invention, and desire to secure by Letterslatent, is-

1. A speedometer, comprising a stationary, permanent-magnet, a rotary plate adjacent to said magnet, one or more armaturepieces on said plate, a non-magnetic metal disk interposed between the magnet and the netic lines of force, a spring having a tendency to turn the said element in the'oppcsite direction to the action of the eddy-currents induced by the-rotationof the armature, and an indicator for indicating the deilec-tionoi' said disk from its normal position,

2-. A speedometer, comprising a station-,

ary, permanent magnet, a rotary plate located adj acentto said magnet and means for adjusting said plate toward and from the saidmagnet, one or more armature-pieces on said plate, a non-magnetic metal disk interposed between the magnctand the armature, s'aid armature-pieces projecting beyond the 4 edge of said disk so as to be entirely inclosed Q by'the magnetic lines of force, means for adjusting said disk toward andi'rom the arma-' J ture,a spring having a tendency-to return from its normal position.

ary, permanent magnet,;a rotary plate adjacent to said magnet, one or'more'armaturepieces on said plate,anon-magnetic metal April, 1906. v v

, ADALBERT FLEISCHMANN.

Witnesses:

KARL MERZ, JEAN Grimm).

said disk to its normal position, and an indir I cator for indicating the deflection of said disk disk interposed between the magnet and the 3. A speedometer, comprising a st'atio'n- In testimony that'I claim the for'egoingas n my invention I have signed 1ny name',- in 7 presence of two witnesses, this 27th day 0i" 

